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Meet Minnesota's modern day cave man

By Jeff Baenen, The Associated Press

Posted:
11/07/2013 10:00:32 PM EST

Meet Minnesota's modern day cave man

John Ackerman poses in the entrance to his Temple of Doom, one of the 37 caves on his property near Spring Valley, Minn. (Jeff Baenen/AP)John Ackerman is a big-time landlord of subterranean real estate.Ackerman, 59, owns Spring Valley Caverns, the largest private cave in Minnesota but just the beginning of his underground empire, which he calls the Minnesota Cave Preserve. He holds the keys to more than 40 miles of caves hidden beneath the rolling farm fields of Minnesota and ...